This is incorrect. I worked at Google at the time and commented on the original document. He posted it in a few small groups related to diversity. Nothing happened. Then he posted it in a relatively large public group unrelated to diversity. There was discussion in that group, and as part of that discussion it went viral (being linked elsewhere and posted around).

It was specifically because of the "mostly ignored" that he chose to escalate to a larger group where he felt he'd get more feedback and response (and agreement).